Adding GSAP 1.10.2

- Added TweenMax.globalTimeScale() method for getting/setting the global time scale (often it's better to use TimelineLite.exportRoot(), though, so please see docs).

- Added a workaround for the iOS bug that sometimes neglects to call the requestAnimationFrame callback when returning to a tab that had been inactive (browser bug, not GSAP), causing animations to cease.

- Fixed issue that could cause tweens in a nested TimelinLite or TimelineMax not to render their beginning states correctly when the virtual playhead of the grandparent is moved backwards beyond the starting point of the parent timeline.

- Altered autoAlpha behavior in CSSPlugin so that instead of explicitly setting visibility to "visible" when opacity isn't zero, it now sets it to "inherit" so that behaves more intuitively when it has an ancestor whose visibility is "hidden" (the descendent should honor that)

- Fixed an issue that could cause fromTo() tweens not to render their initial state correctly when the "from" value is relative (has a "+=" or "-=" prefix).

- Added "scroll", "scrollTop", and "scrollLeft" types to Draggable and improved performance.

- Minor performance improvements